export function format(time, format) {
  var t = new Date(time);
  var tf = function (i) {
    return (i < 10 ? '0' : '') + i;
  };
  return format.replace(/yyyy|MM|dd|HH|mm|ss/g,
    function (a) {
      switch (a) {
        case 'yyyy':
          return tf(t.getFullYear());
        case 'MM':
          return tf(t.getMonth() + 1);
        case 'mm':
          return tf(t.getMinutes());
        case 'dd':
          return tf(t.getDate());
        case 'HH':
          return tf(t.getHours());
        case 'ss':
          return tf(t.getSeconds());
      }
    });
};